Process control transmitter with adaptive analog-to-digital converter
First Claim
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1. A transmitter for use in a process control system, comprising:
- a sensor adapted to couple to a process and provide a sensor output related to a parameter of the process;
a modulator coupled to the sensor output responsively providing a digital bit stream output representative of the sensor output;
a filter decimating the bit stream output and providing a plurality of current outputs with differing resolutions or bandwidths; and
selection circuitry coupled to the filter which automatically selects one of the plurality of current outputs and responsively provides an output representative of the parameter.
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Abstract
A transmitter for use in a process control setting includes a sensor adapted to couple to a process and provide a sensor output related to a parameter of the process. A modulator coupled to the sensor output responsively provides a digital bit stream output representative of the sensor output. A filter provides a current decimation output. A comparator compares a previous decimation output with the current decimation output. Circuitry is provided for transmitting an output related to the parameter based upon the current decimation.
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Citations
27 Claims
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1. A transmitter for use in a process control system, comprising:
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a sensor adapted to couple to a process and provide a sensor output related to a parameter of the process; a modulator coupled to the sensor output responsively providing a digital bit stream output representative of the sensor output; a filter decimating the bit stream output and providing a plurality of current outputs with differing resolutions or bandwidths; and selection circuitry coupled to the filter which automatically selects one of the plurality of current outputs and responsively provides an output representative of the parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A transmitter for use in a process control system, comprising:
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a sensor adapted to couple to a process and provide a sensor output related to a parameter of the process; a modulator coupled to the sensor output responsively providing a digital bit stream output representative of the sensor output; a filter decimating the bit stream output and providing a current output related to the parameter at a current resolution or bandwidth related to a selection signal; and selection circuitry coupled to the filter which provides the selection signal to automatically select the current resolution or bandwidth as a function of the current output. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A transmitter for use in a process control system, comprising:
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sensor adapted to couple to a process and provide a sensor output related to a parameter of the process; a modulator coupled to the sensor output responsively providing a digital bit stream output representative of the sensor output; a filter decimating the bit stream output and providing a plurality of outputs at differing resolutions or bandwidths thereby providing a plurality of automatically selectable resolutions; and output circuitry coupled to the filter which provides a transmitter output related to at least one of the plurality of outputs related to the parameter. - View Dependent Claims (20, 21, 22)
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23. An analog to digital (A/D) converter, comprising:
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a modulator coupled to an A/D input responsively providing a digital bit stream output representative of the A/D input; a filter decimating the bit stream output and providing a current output related to the A/D input at a current resolution or bandwidth which is related to a selection signal; and selection circuitry coupled to the filter which provides the selection signal to automatically select the current resolution or bandwidth as a function of the current output.
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24. An analog to digital (A/D) converter, comprising:
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a modulator coupled to an A/D input responsively providing a digital bit stream output representative of the A/D input; a filter decimating the bit stream output and providing a plurality of outputs at differing resolutions or bandwidths thereby providing a plurality of automatically selectable resolutions; and output circuitry coupled to the filter which provides an A/D output related to at least one of the plurality of outputs.
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25. A method of monitoring a parameter with a transmitter in a process control system, comprising:
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sensing the parameter and providing a sensor output; modulating the sensor output and responsively providing a digital bit stream output; decimating the bit stream output and providing a plurality of outputs at differing resolutions or bandwidths to thereby provide a plurality of automatically selectable resolutions; and providing a transmitter output related to the parameter based upon at least one of the plurality of outputs. - View Dependent Claims (26, 27)
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Specification